I have no idea if this is a bug, but on the Nintendo Switch edition of Minecraft (Version 1.9.0) I threw some lingering potions down. The clouds did not disappear after at least a minute. The clouds had no effects in survival mode, leading me to believe the actual effect was gone, but the clouds remained for no reason. I hope it is just a visual bug, and not intentionally. (I only know about this bug on the Nintendo Switch version though, since the only other Minecraft I have is the Xbox 360 version, where lingering potions don't exist.)
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this also happened to me on Xbox one yesterday
Moved to the correct project.
Issues that concern the Minecraft Bedrock version (Better Together) can be reported to the Minecraft (bedrock codebase) bugtracker.